I'm going to begin by asking you to read about superacids and SCP-075. I'm afraid those two alone are about to derail the majority of this article.

Next, I'm going to bring up your wordiness. This is a good example of "Less is more." Try to find a way to trim out some unnecessary wordage. For example, instead of saying

SCP-XXXX seems to be able to degrade 87% of known acid resistant metals and plastics, and the other 13% is either unavailable, or extremely rare.

Try instead saying

SCP-XXXX has been found to degrade all readily available acid resistant materials.

That being said, I again point you toward SCP-075 and superacids. I will also make note of the fact that potency does not equate corrosion. Fluorosulfuric acid, the strongest acid known to current science (in reality, not Foundation-verse), can be stored in a glass bottle.

Another hit on your science:

In preparation of breach, all on-site have been issued ████████████ brand Acid resistant liquids containing 150ml.

Do some research and try to understand acid and liquids in general. Liquids do not "contain" a volume, liquids fill a volume. Additionally, you might have better luck with basic chemistry than trying to use "acid resistant liquids".

Next, I want to look at your MTF teams and your eager desctruction of an entire facility. In short, this entity's hazard levels do not warrant nuclear armaments and "panicking" MTF agents. This is the sort of creature that they are trained to handle.

Following that, too much redaction and expungement. You've crossed the line from "mystery" into "I'm too lazy to look up commonly used sites and teams".

And finally,

"Fucking approved! No need to even ask. This piece of shit needs to be destroyed" - O5-X

O5 council members are highly, highly unlikely to ever speak like this.

Katma above did a pretty good job with the writing and science, so I guess I'm going into idea stuff.

No offense, but this idea is pretty bad. "Indestructible murder-beast" is probably the most commonly drafted Keter, and also the one most likely to fail, especially if they do nothing but kill people and have overpowered abilities. 682 did well because it took over-the-top and made it extreme enough to be interesting, 106 works because it's so freaking scary, 076 is good because it fits into a bigger story, etc.
Your idea is just a sentient acid blob, which isn't particularly original or interesting. Since it appears to have no cognitive functions, you can't come up with some compelling story about why it does what it does. Also the nature of the object isn't interesting enough to stand on its own.
At this point I would suggest either a very heavy and extensive rewrite, or just abandoning the idea altogether.